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Multiple list link adaption

A link-adaptive, serial technology, applied in multiplexing communication, transmission modification based on link quality, advanced technology, etc., can solve problems such as complexity

Inactive Publication Date: 2006-09-27
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the disadvantage of this configuration is the additional complexity, which requires implementing a feedback channel and measuring each received spatial channel

Method used

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Experimental program
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Embodiment Construction

[0035] as above about figure 1Said, in a link adaptive system predetermined levels or modes of throughput, data rate or performance are assigned and the system moves up and down between these levels in a linear fashion according to current link conditions such as SNR. Typically, each class is associated with a specific combination of modulation and channel coding rates or a predetermined modulation and coding scheme (MCS). Higher levels may have higher modulation rates (eg, QPSK vs. BPSK) and / or higher channel coding rates (eg, 2 / 3 vs. 1 / 2).

[0036] However, this configuration is limited if channel conditions or qualities are constantly changing or when they are difficult to estimate reliably eg in an indoor WLAN type environment. This problem is exacerbated in transmit diversity or spatial multiplexing systems, such as MIMO, where many factors (which cannot always be estimated reliably) affect the performance of the system.

[0037] figure 2 A schematic diagram of a MIMO...

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Abstract

The present invention relates to link adaptation in wireless communication, and in particular though not exclusively to wireless local area networks (WLAN). The present invention provides a link adaptation system for communication systems using multiple but separate transmission parameter options. This equates to a 'double list' approach compared with the known 'single list' approach. The data can be transmitted according to two or more series of predetermined transmission modes, each mode series having a common base transmission parameter such as its space time coding, and one or more rate transmission parameters such as modulation or channel coding rate. Examples of different space time coding include a more robust Alamouti ST code and a spatial multiplexing code such as BLAST. The base and rate transmission parameters can be changed independent of each other thus providing a '2D' adaptation path network of up-rating and down-rating paths. This arrangement provides great flexibility because no explicit, reliable or continuous estimation of certain channel parameters is needed.

Description

technical field [0001] The present invention relates to link adaptation in wireless communication systems, and particularly, but not exclusively, to wireless local area networks (WLANs). Background technique [0002] Link adaptation techniques are commonly used in modern wireless communication standards such as IEEE 802.11 (WLAN). Because channel conditions change over time due to mobility of terminals, fading, interference, and other well-known factors, it is necessary to adapt the data transmission in order to optimize its reception by the receiver. For example in a channel with a lot of interference and noise, the probability that a receiver will be able to accurately receive a signal sent at a high rate is low. It is therefore better to reduce the transmission rate in order to increase the receiver's ability to receive data. The transmission rate can be varied by several parameters such as the coding scheme and its modulation rate. [0003] model Data Ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04J99/00H04L1/18H04W16/28H04W28/00H04W28/18
CPCY02B60/31H04L1/0009H04L1/0003H04L1/1867H04L1/0668H04L1/0625Y02D30/50H04L1/0006
Inventor 迪米特奥斯·斯卡拉帕里斯
Owner KK TOSHIBA